Undivided Electrochemical Laundry Bleaching With Diamond Electrodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current laundry detergents face challenges in protecting sensitive ingredients from bleach components, particularly in liquid detergents, due to the instability of bleach activators like hydrogen peroxide under alkaline conditions, leading to increased energy consumption and maintenance costs with complex divided electrolytic cell systems.
Innovation Solution
The use of boron-doped diamond electrodes in an undivided electrochemical cell for in situ generation of bleach activators, such as hydrogen peroxide and peracetic acid, reduces energy requirements and eliminates the need for additional containers and membranes, allowing for effective bleaching at lower temperatures with reduced exposure to harmful radicals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a divided electrolytic cell system is used for in situ generation of bleach activators, then bleaching performance is improved, but device complexity and maintenance costs increase due to additional membranes, containers, and pumps
Solution Approach 1:
The patent extracts and removes the membrane component from the divided electrolytic cell system, transitioning to an undivided cell configuration. This eliminates the need for membranes, additional containers, and pumps while maintaining the in situ generation of bleach activators, thereby reducing device complexity and maintenance requirements while preserving bleaching effectiveness
Solution Approach 2:
The patent merges the anolyte and catholyte circuits into a single undivided electrolytic cell, combining functions that were previously separated by membranes. This integration simplifies the system architecture, eliminates the need for complex membrane management, and reduces maintenance costs while still enabling effective bleach activator generation
2Stability of the object's composition
If bleach components and sensitive ingredients are kept separate in multicompartment systems, then ingredient stability is improved, but ease of operation deteriorates due to complex user-friendly interfaces
Solution Approach 1:
The undivided electrolytic cell system performs automatic in situ generation of bleach activators during the washing cycle, eliminating the need for manual compartment management by users. The system self-regulates the chemical reactions to produce hydrogen peroxide and peracetic acid as needed, maintaining ingredient stability while simplifying operation to a single-step process
Solution Approach 2:
The system performs preliminary electrochemical reactions to generate bleach activators in situ before they are needed for actual bleaching during the wash cycle. This preliminary action occurs automatically within the undivided cell, ensuring ingredients remain stable until activation while requiring no special user intervention
3Productivity
If hydrogen peroxide is used as a bleach component under alkaline conditions, then bleaching effectiveness is improved, but loss of substance increases due to decomposition and gas evolution
Solution Approach 1:
The undivided electrolytic cell system continuously generates hydrogen peroxide in situ during the washing cycle through electrochemical reactions. This continuous generation occurs at the cathode, providing a steady supply of bleach activator that matches the consumption rate, thereby maintaining bleaching effectiveness while minimizing decomposition losses through sustained low-concentration operation
Solution Approach 2:
The system changes the operational parameters by maintaining lower, sustained concentrations of hydrogen peroxide through continuous in situ generation rather than using high initial concentrations. This parameter change reduces the driving force for decomposition reactions and gas evolution while maintaining effective bleaching through prolonged exposure to moderate concentrations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach achieves effective bleaching with reduced energy consumption and minimal exposure of sensitive detergent constituents to harmful radicals, providing a simpler, low-maintenance system that maintains washing performance while being environmentally friendly.
Implementation Method 1
electrolytically generate hydrogen peroxide (U.S. Pat. No. 6,387,238) and react the hydrogen peroxide with TAED (tetraacetylethylenediamine) to form peracetic acid
Implementation Method 2
The use of diamond electrodes in the context of bleach activation has hitherto not been described... boron-doped diamond electrodes can be used for textile bleaching
Data Source
AI summary
The present invention relates to a washing machine comprising an electrochemical cell, to a process for electrochemical cleaning of fibers, to laundry detergents for electrochemical cleaning of fibers and to the fibers thus cleaned.